We are trying to migrate from Nagios Log Server 2024R1.3.6 to the latest release 2026R1.2.1. On the old server, we have changed the setting to allow Elasticsearch to listen on all interfaces, and we have added a firewall rule in the operating system to allow this traffic over port 9200/tcp. However, when we run ss -antp | grep LISTEN, we only see 9200 listening on 127.0.0.1. We have tried rebooting the entire system, and the results are the same. I do see port 9300 appears to be listening on all interfaces, but I'm not sure what that is for.
We have tried connecting from the new server running 2026R1.2.1, and it does not work. We tried both via the "Migrate data" feature, and from the command line using netcat (nc). Any assistance you can provide would be greatly appreciated. Thank you.